Hack saw



A. M. REMINGTON.

HACK SAW.., APPLICATION FILED APR. I6, I92].

Patented Aug. 1, 1922.

I in? 06 1399:

ALFRED IVL. REMINGTON, OF FITCHBURG,

ivrassacnusnrrrs, assieiron *ro si'ivronns' MANUFACTURING COMPANY, or error-reuse, MASSACHUSETTS, 1 CORPORATION OF MASSACHUSETTS. i j i HACK TON, acitizen of the United States of Amen, 10a, and resident of Fitchburg, in the county of Vforcester and State ofMassachusetts.

have invented new and useful [Improvements in Hack Saws, of which, the following is a speeification.- V

The objects of the invention are to proyide a hack-saw which has few-parts, which is simple and economical in construction, which is rigid and durable in use, which is readily adjustable to blades of different lengths, in; which ablade may be quickly and easily mounted and tensioned, which has no thumbnut at the end ofthe frame, which is stiff and compact, and which isnon-collapsible when the blade breaks.

Instead of using auxiliary tensioning, meansat the junction ofthe blade with one of the bladesupporting arms, involving ad.- ditional parts which add to the cost of manufacture and to the difliculty of operation, the, present inventioncontemplates a unique interconnection,between one of the blade-supporting arms and the longituc linalj frame bar by virtue of which, the arm may be moved relatively to the bar not only to tension the blade, but also to adjust for bladesof different lengths. Thus instead of requiring two adjusting means, one between the arm andbarto adjust for bladesof dif ferentlengths and onebetween the arm and blade to tension the blade, the present inven tion provides a single: adjusting means adapted to serve bothpurposes v The tensioning movement of thearm rela tively to the bar is preferably effectediby means of a screwinterengaging between the frame and arm and this movement is preferably a swinging movement. This may be accomplished by providing the arm with two bearings spaced longitudinally of the bar, one bearing engaging the side of the barnext to, the blade and the other bearing engaging the v opposite side of the bar, and one bearing comprising a screw or other adjustablexdevice whereby the armm'ay be swung about the other bearing as apivot.

The hearings on said opposite sides of the bar may be provided by making a recess in the arm to receive the bar so that the arm surrounds the bar on at least three sides (top, bottom and one side), but the recess is preferably in theform of an opening ex tending throu saw. a

I Specificationbf Letters Patent. Patentedr eiugu l, 1922.

entirely surrounded. j i i H i j ln order to space said bearings farther apart along the A bar, and thereby increase a the leverage of the tens ioning adjustment, the arm is preferably provided with a head having bearing portions extending for- \vardly and rearwardly, respectively, from the .arm along the bar. a I J I The two bearings may bev variously 10-,

cated relatively to the arm and bar, so long as, they areseparatedilongitudinally of the bar rbut they are preferably located for wardly and rearwardly, respectively, of the center line of the arm, with the forward bearing inside thebainand the rearward bearing outside the bar; By malring the inside bearing the adjustable bearing it does not project outside the" outline of the frame, but I prefer to make theoutsidebearing the adjustable one inasmuchflas it is more acces sible for adjustment, H j j In order to restrain the adjustable; arm, against;displacement longitudinally of the bar. after it has been, properly positioned for the length ofthe blade to be used, one of h the arm so that the the bearings,preferably the non-adjustable bearing, is arranged to interengage with the bar for example by means of a tongue and groove interengagement, the tongue preferably being on the arm and the groove on the bar. i i i Y One of the frame arms may be used as a handle butrwhen the adjustable arm is provided with a head the head preferably has a handle extending therefrom iuspaced relationship to the arm. I I

In order more' clearly to illustrate the nature of the invention I have-illustrated one embodiment ther of in the accompanying drawings, in which,- v i F 1 is a side elevation'of a hack-saw frame with a blade mounted therein; .Fig. 2 is a similar view; withthe blade re, moved; 1

Fig. 3 is a ertical transverse section'onthe line 3 30f Fig. 1; and l H j Fig. l is a vertical longitudinal. section of,

' the rear portion orbody of the frame.

The particular embodiment of the invene tion illustratedin the drawings comprises a longitudinalbar l eirtending the full length of the blade and somewhat beyond the rear end ofthe blade, and two, transverse arms 2 and to which the bladed adapted to ,be attached by of pins and Glenn- 2 lockvtheladjustable armfia to the frame 1 I s tending laterally from the arms 2 and 3. I

' The arm 31- is-provided with. ahead haying,

forwardly; and r'earwardly extending por- 5 tions 7 and 8 respectively; The head is provided with an opening 9 to receivethe bar 1, this opening being] in the-form of a channel top except atthe rear end where the top is closed by a b-ridgelO; i The under surfaceof the bridge 10 is preferably inopen at the 'cljined' soias to seat squarely against the upperside of the bar 1 the parts shown inFigjQL A set screw 11 is threaded through this bridge to engage l5 1 portion '(Qof the head is provided with-a tonguefi adaptedto, into anyone of the grooves 13] in "thelowerjside of the bar 1 and the rearward portion 901? the head; is

stop 13 ;adapted tos'eat againstthe lower side of the barf l. The rear end: 8. of the head is provided with a dependent handle 14; by which the saw maybe operated.

In placing a blade in the frame the set screwvl'l is threaded out to the position shown in" Fig. 2 whereupon the body, com

prising arm B', bread hand handle ll, into the position shown in Fig; '2. The bodyjmay then be adj usted' longitudi nall y'iofithef bar until the tongue. 12 seats in the particular groove l3-fwhichaiiord's the proper spacing between'the pins 5 andfi to suit the'b-lade'tto be used',iwhereupon the 35,

threading the set screw downwardly through the bridge 10- against a the upper sideof'thefbar 1,'the bodyof the frame is swan-g in "ai'counter-clockwise direction about the tongue-andggroove' inter-engagement until the stop 13? seats against the bottom of the bar 1 or until the blade is properlyte-n'sioned. I i j i "From the f regoing it willbeevident that construction} By virtue oft/he long head 7% 8 fitting around the bar. 1 and the spaced bearings at the tongue 12 and' set-r and rigid inuse. The frame is readily ad- Convenient and which does" not interfere with the use of. the saw. With the stop 13? bearing against the bottom of the barl, or" {even if it is slightly spaced from the bar,l

the: frame not, "collapse when the blade breaks- Indeed, the frame would be noncollapsible without thestop 18?, the body merely beingslidable on thebar 1" when a.

blade' breaks. Thus the single screw .11

the blade,

in the position of the upper side of the bar ,1. The forward provided, in thebottomiof the recess 9; with blade ishooked' over the pins?) and'G. By

my improved hack-saw fr ame involves only three parts and 1s snnple and economical" in screw 1 11 vresp-ectiv elylthe frame is very'stiff other bearing.

serves both to tension the blade and also to the. blade and having at one end thereof a lateralarm i adapted to support one. endot a second arm pivotally' mounted on said bar to support the other end of the blade, means for swinging the second arm on the barto tension the blade, positively to hold said arm substantially in normal position independently of the ten-' sion of the blade, j 2. A hack-saw trams compr sin'galong1- tudinal bar anda transverse ing a recess of the bar to engage the bar on the side" bar to restrain displacement of the arm lengthwise of thebar, one other bearing being adjustable toswing the arm in the planeoff-the blade, and the three bearings being correlated to hold the arm substantially normal position independently of the tension of the blade;

3. A hack-saw frame comprising ailongithe side next tofthe blade and onthe oppoand means bladesupport ing arnradjustahle thereon, the arm hav therein to receive the'barand having three bearings spaced longitudinally 7 tudinal bar and a transverse 'blade-support-f site side respectivelyythe 'barand one ef said bearings having a transverse ton guee I andgroove interengagement, and another bearingfcomprising a. screw adjustable to said transverse tongueswing the arm about and=groove interengager'nent', and theother bearing being correlatedwith the first two bearings to-hold the farm" substantially in normal position independently-"of the blade.

4;. A hack-saw framecomprisingalongi 'tudinal bar and a blade-tensioni'ngarin adjustable thereon said arm having ahead provided with forwarjdand rearward por tions extending along said bar i nboth dire'c'e;

'tions from the arm, j said head havingjan opening to receive said bartheret-hrough, said bar having bearlng surfaces/facing to-' ward and fromthe bladerespectively;said

rearward and forward portions *of 'the head 5'. A hack-saw frame comprising a longitudinal bar and a bladetensioning arm adjustable thereon, said arm having a head provided with forward and rearward; porhaving bear ngs engaging said bearmglsun tions extendingalong said barinfbot'hdireo tions from "the arm, isaid" head shaving an opening to receive said bar therethrough,

said [bar having bearing surfaces facing to Ward and from the blade respectively, said rearward and forward portions of the head having bearings engaging said bearing surfaces respectively, one of said bearings being adjustable tosWing said head about the other bearing, and said head having a handle extending therefrom in spaced relationship to said arm.

6. A hack saw frame comprising a longitudinal bar, a transverse bladesupporting arm on said bar, said arm having an elon threaded through said bridge to engage said bar whereby said arm is caused to swing upon one end of said elongate portion as a pivot for tensioning the blade, and a handle on said elongate portion for operating the frame.

Signed by me at Fitchburg, Massachusetts, this eighth da of April, 1921. ALFR-E M. REMINGTON. 

